A week ago, seventeen-year-old Lela Santos's best friend, Nadia, killed herself. Today, thanks to a farewell ritual gone awry, Lela is standing in paradise, looking upon a vast gated city in the distance - hell. No one willingly walks through the Suicide Gates, into a place smothered in darkness and infested with depraved creatures. But Lela isn't just anyone - she's determined to save her best friend's soul, even if it means sacrificing her eternal afterlife. As Lela struggles to find Nadia, she's captured by the Guards, enormous, not-quite-human creatures that patrol the dark city's endless streets. Their all-too-human leader, Malachi, is unlike them in every way except one: his deadly efficiency. When he meets Lela, Malachi forms his own plan: get her out of the city, even if it means she must leave Nadia behind. Malachi knows something Lela doesn't - the dark city isn't the worst place Lela could end up, and he will stop at nothing to keep her from that fate.